Rheem RTG74 User Manual

SVC 810 Tankless Troubleshooting Manual
10
Heat Exchanger Thermistor
The Heat Exchanger Thermistor monitors the temperature of the water
inside the heat exchanger. It will activate to Error Code 15 if the water
temperature exceeds 207º F for more than 15 seconds; or 230º F for more
than 1 second. It will also show an Error Code 32 if the thermistor is
disconnected from the circuit board.
Maintenance Panel Display
The Rheem Tankless has a Maintenance Display chart on the remote
control panel. To access the Maintenance Display, turn the unit OFF.
Then hold down the UP and DOWN arrow keys at the same time for a
few seconds. You will hear an audible beep and see the display go to
0E. By pressing the UP and DOWN arrow keys on the remote display,
you can access a variety of information about the machine. For Example
a code at 3E (recent faults) may display as 21 (Error Code 21).
Shortcut: Lift dip switch #1 to the up position to go immediately into maintenance mode.
First Digit – Use DOWN (▼)arrow key on Remote Control
0* 1* 2* 3* 4* 5* 6* 7* 8* 9*
*E Null Fault Codes of the most recent 8 faults Null
*F Null Sequence Number of the most recent 8 faults Null
*C Total combustion times until recent error fault (** x 10000times) Null
*D Total combustion times until recent error fault (** x 100 times) Null
*H Total combustion period until recent error fault (** x 1000 hours) Null
*J Total combustion period until recent error fault (** x 10 hours) Null
*Y
Flame Rod
Status
GPM Flow Rate
(*.* gpm)
Ambient Air
Thermistor
Temperature
Cold Water Inlet
Thermistor
Temperature
Heat Exchanger
Thermistor
Temperature
Hot Water Outlet
Thermistor
Temperature
Fan Speed x 100
RPM
Power for
P.G.F.R. valve
Null Null
Second Digit – Use UP (►) arrow key on Remote Control
*A
Thermo Electromot ive Force Control Line Volta
g
e
Fan Detective Value Fan Motor Current Null Null Null Null Null Sequence Number
You can turn the unit on while in Maintenance Mode by quickly pressing the ON/OFF button
one time. The temperature will default to 120 degrees and will not display because you are still
in Maintenance Mode. If you demand hot water, the unit will fire off and you will be able to read
the “Y” line in real time. That means you will see the actual flow rate in gallons per minute, the
cold-water inlet temperature, the hot water outlet temperature, heat exchanger temperature, and
flame rod status.

Rheem RTG74 Specifications

General

Brand	Rheem
Model	RTG74
Category	Water Heater
Language	English